Furnace.



R. NIEDERGESAESS.

FURNACE.

APPLICATION FILED DEC. 17. 1914.

Patented May 30, 1916.

2 SHEETS-SHEET Iv llVI/ENTOI? Raloe/"t Niederqesaess BY WITNE88ES:

A TTOR/VEY R. 'NIEDERGESAESS.

FURNACE.

APPLICATION FILED'DEC. H; 1914;.

Patented May 30, 1916.

IIVI/ENTOR 2 SHEETS-SHEET 2.

A TTORA/EV UNITED STATES-PATENT OFFICE.

ROBERT NIEDERG-ESAESS, SEATTLE, WASHINGTON, ASSIGNOR TO AMERICAN SMOKELESS BURNER COMPANY. A. CORPORATION OF WASHINGTON.

FURNACE.

To all whom it may concern: I

Be 'it known that I, ROBERT NIEDERGE- SAESS, a citizen of the UnitedStates, residv ing at Seattle, in thecounty of King and State ofWashingtomhave invented certain new and useful Improvements in Furnaces,of which the following is a specification.

This invention relates to mechanically operated stokers for furnacesandis in the nature of improvementsto th invention for which I filed apatent application January 15, 1914, bearing Serial No. 812,254.

The object of my improvements is the perfecting of apparatus of thischaracter to render the same more eflicient in operation, which willafford a uniform fuel feed and cause the same to be consumed with littlewaste. I The invention consists inv the novel construction, adaptationand combination of parts, as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal verticalsection of apparatus embodying the present invention. Fig. 2 is a planview of the same, but with the fender plates disposed in differentpositions from which they are illustrated in Fig. 1. Fig. 3 is a viewshown partly in end elevation and partly in vertical transverse sectionof the mechanism. for supplying fuel to the fuel'receptacle of thefurnace. Fig. 4 is a horizontal section taken substantially through 44of Fig. 1.

The reference numeral 5 designates a table which is supported on posts 6and may constitute the base of a furnace. Depending from said table andrigidly secured thereto, asiby bolts 7 is a fuel receptacle 8 ofsubstantially the shape of an inverted frustum of a cone. Disposedaxially of said receptacle and extending upwardly from the fioor 9thereof is a tubular column 10 provided exteriorly with a helical rib 11similar to the thread of a screw. Extending down into the receptacle 8is the casing 12 of a fire-pot which is lined with fire-brick 13 or anequivalent. This fire-pot is of a funnel-shape having an upper flaringportion 14 and a throat 15 therebelow of asubstantially cylindrical formwith a diameter somewhat greater than the diameter of the outside of therib 11 of the column which extends through said throat. Said Applicationfiled December 17, 1914. Serial No. 871,679. 1

Specification or Letters Patent. 1 Patented May 30, 1916.

fire-pot is provided with an external .flange T or track element 16Which is mounted upon rollers or wheels 17 journaled upon axles 18supported in suitable boxesprovided in the peripheral wall of thereceptacle 8.

Exteriorly'of the fire-pot casing 12 is a helical flange or screw-blade19; -R'idges 20 and 21 respectively project inwardly from the walls ofthe receptacle 8 and the throat 15 and are inclined from vertical planesextending radially of the axes of'thereceptacle and throat. p

22 represents a pipe whereby water is supplied tothe receptacle toapproximately the level indicatedby W L in Fig. 1. Provided on thefire-pot casing are peripheral gearteeth 23 which mesh with a spur-gear24 mounted on an upright shaft 25 which is rotated by gears 26 from anupright shaft 27 The latter, in turn, is rotated by bevel gears 28 froma horizontal shaft 29 which is driven from a motor 30 by a belt 31passing about pulleys 32 and 33 on the shaft 29' and the armature shaftof the motor.

34 represents a rotary fan or blower which is driven from the motor 30by a belt are sloped circumferentially to afiord a screw-like structurewhich tends to cause the revolving fuel engaging thesame to beforcedupwardly. One of the horns, 38 extends as shown in Fig. 1, abovethe other horns and serves to disrupt or break masses ofcoke or clinkerswhich may impinge the horn.

The perforations 40 of the various horns are disposed at thesides of thelatter in the direction in which the fuel is revolved so that there isno danger of their becoming choked by fuel being forced thereinto.

In the operation of the apparatus, the solid combustion products thereofare forced upwardly from the fire-pot onto the rim of the latter, and intheir revoluble travel they encounter a horizontally disposed ,plate 41having an inclined guiding face 41 (Fig. 2) y Included in the inventionis a conveyer for feeding the fuel to the receptacle 8. Said conveyerconsists of a chain belt 43 operating in ,a trough 44 leading from acoal hopper 45 into said receptacle, as best.

shown in Fig. 3. The chain 43 passes about i an idler 46 and asprocket-wheel 47 which is mounted'upon a shaft 48. This shaft isintermittently rotated by having a ratchet wheel 49 thereon engaged by'a springpressed pawl 50 which is carried by a vibratory arm 51 looselymounted on the shaft 48. The arm 51 is actuated by a pitman 52 from apin 53 of a crank shaft 54 which is rotated by means of a belt 55 fromthe shaft 29. a The conveyer chain 43, as shown in Fig. 3,

passes into the receptacle 8 to deposit the coal therein and, to preventany lumps reaching the sprocket wheel 47 the chain is caused to passthrough a slot 56 of a bracket-piece 56 Subjacent to the fire-pot androtatable therewith is a plurality of curved blades 57, Figs. 1 and ,4,which serve to impart revoluble motion to the coal and transmit the samecentripetally to the thread 11.

In operation, the fire-pot is continuously rotated whilethe receptacle8, the screw column 10 and the twyer head 37 are immovable. The fuel inthe nature of coal is fed into the receptacle by means of the conveyer'chain 43. The fuel thus deposited within the receptacle falls into thewater contained in the receptacle, and .is forced down by the revolvingscrew-thread 19 acting in coeperation with the ribs 20 which tend toprevent anyturning of the coal until it is brought within the scope ofscoopblades 57. When this occurs, the revolving blades 57 impartcorresponding motion to the coal and cause it to progressively travel tothe stationary column 10. The revoluble movement of the coal when itencounters the screw-thread 11- of said column causes it to be therebyraised through the throat 15 into the upper portion 14 of the fire-pot.In such ascending movement of the coal, it is given a rotary movementwhich is afforded by the revolving ribs 21 and by contacting with theinner periphery of the fire-pot. As the coal is thus turned, it issubject to the heat due to the burning at or near the top of the pot,and becomes more or less coked, which is principally broken up by beingimpinged against the horns of the twyer head. Lumps of coke which mayoverflow the firepot are pushed back into the latter by the inclinedface41 of plate 41 and the ashes in the form of clinkers, upon engagingthe plate 42, are directed thereby over the top .of the table 5.Ihe'fire is sealed with reat a speed to supply coal sufficient to meetthe demand, and through the offices of the stationary and rotaryscrew-devices and the revolving scoop-blades the fuel is elevated to beburnt in the fire-pot.

What I claimeas my invention, is

1. In a device of the class described, a fuel "receptacle, arotary'fire-pot having an open bottom, and fixed means coacting withsaid rotary fire pot for progressively elevating fuel from saidreceptacle into said fire pot.

2. In a device of the class described, a fuel receptacle, a rotaryfire-pot, and screw de' vices extending from the receptacle and affectedby the rotation of said fire-pot to elevate fuel into the latter fromsaid receptacle.

3. In a device of the class described, a fuel receptacle adapted to holdwater to a predetermined depth, an annularfire pot positioned within thereceptacle, means to rotate said fire pot, and non-movable meanscoacting with said rotatable fire pot to elevate fuel into the spacewithin said fire pot.

4. In a device of the class described, a fuel receptacle, anannular'fire-pot extend.- ing into said receptacle, means to rotate saidfire-pot about a vertical axis, said receptacle being supplied withwater to submerge the lower end of the fire-pot, means rotatable withthe fire-pot for moving the fuel centripetally of the receptacle andbelow the firepot, and means extending into the fire-pot for elevatingthe fuel receivedv from the aforesaid means up into the fire-pot.

5. In a device of the class described, a fuel receptacle,'an annularfire-pot disposed to rotateabout the vertical axis of said recepthe fuelinto position to be elevated by said column,and means to supply air forcombustion purposes through the column.

7. In apparatus of the class described, a rotary fire-pot, meansactuated by the -rota'- tion of the fire-pot for progressively elevatingfuel into the fire-pot and eventually causing the residue of theconsumed fuel to be discharged upon the top of the fire-pot, and

' means rendered effective by the rotation of the fire-pot for effectingthe removal'of such discharged residue from the top of the firep'ot.

8. In apparatus of the class described, an annular rotary fire-pot,means for elevating fuel into the fire-pot to be burned and deliv:v

ering the resultant ashes upon the top of the fire-pot, a relativelythin deflector inclined with respect to the radii of the fire-pot for.returning into the latter unconsumed portions of the fuel which may bedelivered upon the top of the fire-pot with the ashes, and means formoving the ashes away from the fire-pot.

9. In apparatus of the class described, .a

fuel receptacle, means. for effecting the movement of fuel from theperipheral wall of said receptacle toward the center thereof,

a rotary annular fire-pot, screw devices 00-.

operating with the fire-pot for elevating the fuel inthe fire-pot, atubular member extending axially into thefire-pot, a twyer-z headprovided for said member, and means for supplying air under pressure tothe twyer head through said member.

10. In apparatus of the class described, a

fuel receptacle, means for effecting the movements of fuel from theperipheral wall of said receptacle toward the center thereof,

a rotary annular fire-pot, screw devices 00- operating with the fire-potfor elevating the fuel in the fire-pot, a tubular member extendingaxially into the fire-pot, a twyerhead formed with a radially directedperforated horn fixedly secured to said member.

11. In apparatus of the class described, a

fuel receptacle, means for effecting the movement of fuel from theperipheral Wall of said receptacle toward the center thereof, a

rotary annular fire-pot, screw devices cooperating with the fire-pot forelevating the fuel in the fire-pot, a tubularv member ex tending axiallyinto the fire-pot, means for supplying air under pressure through saidmember into the fire-pot, and means secured to said member for breakingthe coke or screw coacting'with said fire-pot to elevate clinkers whenthe same are revolubly moved into contacttherewith by the turning of thefire-pot.

12. A device of'the class described, comprising a fuel receptacle, arotary fire-pot having an opening in its bottom, a stationary fuel intothe latter, and a twyer-head secured to the top of said stationaryscrew.

13. A device of the class'described, comprising'a fuel receptacle, a'rotary fire-pot disposed within said fuel receptacle, a sta-.

tionary screw coacting with said rotary firepot for elevating fuel intothe latter, said stationary screw being providedwith an air passageway,and atwyer-head secured to the top of said screw and connected with 7said passageway, said twyer head being provided with radially directedperforated horns for breaking coke or clinkers when the same are movedinto contact therewith by r the rotation ofsaid fire-pot.

14. A device of the class described, comprising a rotary fire-pot havingan axially disposed stationary screw to coact with said fire pot andelevate fuel thereinto, a twyerhead on said screw, said twyer-head beingprovided with a radially projecting horn adapted to engage with movingmasses of fuel to break up such moving masses.

' 15. A device of the class described, comprising a rotary fire-pothaving an axially.

disposed stationary screw adapted to coact with said fire-pot to conveyfuel thereinto.

16. A deviceof the class described, comprising a fuel receptacle, arotatable fire-pot disposed therein, scoop-blades rotatable with saidfire-pot to move fuel toward the center of said fuel receptacle, and astationary screw coacting with said scoop blades and said rotaryfire-pot to convey fuel into said fire-pot.

'17. In apparatus of the class described, a

fuel receptacle,,means for effecting themovement of the fuel from theperipheral wall of said receptacle toward the center thereof, a rotaryfire-pot and stationary screw devices coacting with the rotatorymovements of said fire-pot for elevating the fuel in 'the 18. Anunderfeed furnace comprising a furnace chamber, a rotative firepottherein, means toconduct air to the firepot, a' fixed upstandingcentrally arranged. spiral ledge extending upwardly through the firepot,and means to deliver fuel to the chamber and force it inwardly in acompact mass against said spiral flange or ledge.

19. An underfeed furnace comprising a furnace chamber, a rotativefirepot therein,

means to conduct air to the firepot, a fixed upstanding centrallyarranged spiralledge' 4 extending upwardly through the firepot,

ledge, anda'fixed ash scraper above the firepot to scrape the ashesoutwardly away from the rotative firepot.

21. An underfeed furnace comprising a furnace chamber, a rotativefirepot therein,

an air conduit extending upwardly through the chamber and into thefirepot with means ,for forcing air therethrough, said conduit beingprovided within the firepot with a fixed spiral flange or ledge, spiralfuel feed arms rotative in said chamber with the firepot, and means todeliver fuel to the chamher in the path of the said arms.

22. An" underfeed furnace comprising a furnace chamber, a firepottherein,anti-friction bearings between said firepot and'the "fixed Wallsof the chamber, means for rotating' said firepot, spiral fuel feed armsextending outwardly from the open lower end Tof the firepot over thefloor of the furnace chamber, means to feed fuel into the chamber intothe path of the said arms, a fixed upright centrally arranged spiralledge withinthe rotative firepot, and means to force air into the firebed.

23. An underfeed furnace comprising a furnace chamber, a rotativefirepot therein, anti-friction bearings between-said firepot and thefixed wall ofsaid chamber, spiral fuel feed arms extendingoutwardly fromthe lower open endjof the firepot over the fldor of the furnace chamber,means to feed fuel into the chamber into the path of said arms, afixedupright centrally disposed spiral ledge'within the firepotfsaidfirepot being provided with an annular rack, and a said arms, a fixeduprightcentrally disposed spiral ledge within the firepot, said firepotbeing provided with an annular rack, a

' pinion meshing with said rack, means to rotate it, an air blower fordelivering air to the firepot, and a motor for driving said fan andconnected by a speed reducing train of gears to said pinion.

25. An underfeed furnace comprising a furnace chamber, a rotativefirepot therein, a fixed upstanding air conduit provided within thefirepot with exit openings and with a spiral ledge, spiral fuel feedarms rotative with the firepot, means to feed fuel to the chamber intothe path of said arms, and

means to scrape the ashes from. the ash bed above the fire'pot.- I vSigned at Seattle, Wash, this v8th day of December, 1914. 7

ROBERT nrnnnaensanss,

Witnesses E. PETERSON,

HORACE BARNES.

